<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    .outer {
        width: 300px;
        height: 300px;
        /*梯形:1px solid red;*/
        /*box-sizing: 梯形-box;*/
    }
    .outer .one,.two,.three {
        width: 100%;
        height: 33%;
        display: flex;
        justify-content: space-evenly;
        align-items: center;
        /*梯形: 1px solid red;*/
        margin-top: 10px;
    }
    .oneOne,.oneThree,.oneTwo {
        width: 33%;
        height: 100px;
        line-height: 100px;
        text-align: center;
        border: 1px solid red;
        margin-left: 10px;

    }
    .twoOne,.twoThree,.twoTwo {
        width: 33%;
        height: 100px;
        line-height: 100px;
        border: 1px solid red;
        text-align: center;
        margin-left: 10px;

    }
    .threeOne,.threeThree,.threeTwo {
        width: 33%;
        height: 100px;
        line-height: 100px;
        text-align: center;
        border: 1px solid red;
        margin-left: 10px;

    }
</style>
<body>
<div class="outer">
    <div class="one">
        <div class="oneOne"><span>1</span></div>
        <div class="oneTwo"><span>2</span></div>
        <div class="oneThree"><span>3</span></div>
    </div>
    <div class="two">
        <div class="twoOne"><span>4</span></div>
        <div class="twoTwo"><span>5</span></div>
        <div class="twoThree"><span>6</span></div>
    </div>
    <div class="three">
        <div class="threeOne"><span>7</span></div>
        <div class="threeTwo"><span>8</span></div>
        <div class="threeThree"><span>9</span></div>
    </div>
</div>
</body>
</html>
